What is a Star?

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Questions and Answers

What is the source of energy for stars like our Sun?

  • Combustion of hydrogen
  • Nuclear fission reactions
  • Conversion of mass into energy
  • Nuclear fusion reactions involving hydrogen (correct)

What is the primary force that holds a star together?

  • Nuclear fusion
  • Electromagnetic force
  • Gravitational force (correct)
  • Strong nuclear force

What is the interstellar medium (ISM)?

  • The region where stars are born
  • Thinly spread gas and dust in outer space (correct)
  • The area surrounding a black hole
  • The vacuum between stars

What is the name given to the dense clouds of gas and dust where stars are formed?

<p>Nebula (D)</p> Signup and view all the answers

How old is our Sun?

<p>4.5 billion years (A)</p> Signup and view all the answers

What is the initial process that leads to the formation of stars?

<p>Gravitational collapse of molecular clouds (C)</p> Signup and view all the answers

Which of the following is a key factor in the formation and development of stars?

<p>Gravitational attraction (A)</p> Signup and view all the answers

What is the primary process that drives the energy production of stars like our Sun?

<p>Thermonuclear fusion (D)</p> Signup and view all the answers

How do the masses of stars influence their life cycle and evolution?

<p>Stars with higher masses evolve more rapidly than stars with lower masses. (A)</p> Signup and view all the answers

What is the primary source of the interstellar medium (ISM) that eventually leads to the formation of stars?

<p>Expelled matter from supernova explosions (C)</p> Signup and view all the answers

Which of the following best describes the initial stage of star formation from the interstellar medium?

<p>The clouds of gas and dust accumulate and increase in density due to gravity. (D)</p> Signup and view all the answers

How old is our Sun, according to the information provided in the text?

<p>Approximately 4.5 billion years old (B)</p> Signup and view all the answers

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